Lexmark s300-s400 will not print black

My lexmark printer will not print in black. I have replaced the cartage twice so I know that is good. Test pages reveal a VERY slight gray color where the black should be but it is extremely faint.
I have cleaned all the heads and realigned everything to not success.

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When you changed the cartridges, the printer automatically prits a test / calibration page. This page must be placed in the scanner, then you have to press the "scan" key (the green one). It will calibrate an align the system. Then you'll be able to print.

Yup. I suspect the head has been removed from the unit. There are adjustments on some printers. It was assembled wrong. The grating noise is likely the auto cleaner. If it cannot go 'home' the unit will not initialize. Possibly the head detect sensor is broken or covered. If the head will not home (moves out and back more than once or slams home hard), 'Init Unable AF'. You may be able to order a service manual from Brother for this. A repair shop can order the manual as well. (I suspect you need a new print head as well. You might want to replace the printer) see tips on bubblejet printers.

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If you are using one of Lexmark printers that has the new ink system based upon individual tanks (like the following models: S300, S400, S500, S600, Pro200, Pro700, Pro800 & Pro900 Series), these models require all cartridges to have ink them to continue printing.
However, there are some previous Lexmark models that are able to continue printing even if one cartridge is empty.
Should you still need assistance, please leave a comment to my response and I'll get back to you. Should this answer your concern, your rating will be greatly appreciated.

A firmware update for your model addresses a number of issues including print quality issues. Please visit the Lexmark website to download and install the Lexmark S300 Series Firmware Update.
Should the problem persists, please contact Lexmark Technical Support Center for additional assistance. Thanks.

If your device is displaying a 'printhead error' on the
hardware and/or you are suddenly experiencing a print quality issue, please
contact the Lexmark Technical Support Center at 1-800-539-6275 or point your
browser to http://bit.ly/lFKDzs for
online technical assistance.

Lexmark agents are prepared and able to help diagnose and
resolve your issue. This may involve updating your printer firmware and/or
replacing the printhead for your printer, at no charge to you, our
customer. Installation is quick and easy for any customer to
perform.

Your satisfaction with your Lexmark devices is our primary
concern, and we are confident and committed to quickly correcting these issues.

Expand the arrow pointing down beside printer name if you're not able to see other options for printing. Look for Quality and Media in a drop down box and select print in black and white.

If you wish to set this as your default print setting, please follow steps below:
For Windows:

Go to Control Panel.

Open Printers and Faxes.

Right-click on Lexmark S300 Series print object and click on Properties.

In the Lexmark S300 Series Properties window, go to Advanced tab. Click on Printing Defaults.

Under Ink Use, select Print using black ink only. Click OK.

Click OK button in the Lexmark S300 Series Properties window to save the changes.

Your printer will print in black only the next time you send a print job to the printer.

For Mac:

With the file (you wish to print) open, click File.

Click Print.

Expand the arrow pointing down beside printer name if you're not able to see other options for printing. Look for Quality and Media in a drop down box and select print in black and white.

Save this as your default print setting. Click Presets option and choose Save as. You can personalize the name for this default print setting (e.g. Black and White Draft or My Setting).

Select this Preset name every time you print your files/documents.
Note: The 100 standard cartridges yield around 175 ISO Pages. You can also save on ink and stretch your ink investment if you use only 100XL high yield cartridges. These contain almost 3x as much ink as a standard cartridge for a small increment in price.